Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c6b79063d90565…

MALICIOUS

PDF

90.5 KB Created: 2021-03-29 06:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: dbb47a98ef865965f50feb3a48cc10c9 SHA-1: a4eaf787e52917dc26f1d74b73136338d80a6300 SHA-256: 71c6b79063d90565ac97ec6d3929912c018788d4a37862dcede7f2cc3500bd2a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document contains a large number of external links to other PDFs hosted on various domains, many of which appear to be disposable or used for SEO spam. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded links suggest an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mezovuduw.ru/aws?utm_term=digitech+jamman+looper+phrase+sampler+manual+espa%25C3%25B1ol PDF link annotation
    • http://uscarinsurance.info/60835047922uqv3j.pdfIn PDF document text
    • https://cdn.sqhk.co/riwajamugem/bpibFPO/helicobacter_pylori_therapy_guidelines.pdfIn PDF document text
    • https://zunenevalomedo.weebly.com/uploads/1/3/4/8/134855990/ralafegubovolakokem.pdfIn PDF document text
    • https://cdn.sqhk.co/nijalemivowo/GkZIje7/81404351345.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/NdFjahh/spacex_news_update.pdfIn PDF document text
    • https://rabidibizuzej.weebly.com/uploads/1/3/4/6/134648686/lupafubo.pdfIn PDF document text
    • https://cdn.sqhk.co/luvuxokam/EuWgg9S/reflective_report_definition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377663/normal_5feb23d3c7cb6.pdfIn PDF document text
    • https://fekugutupufug.weebly.com/uploads/1/3/4/8/134876907/mebetoxininojo.pdfIn PDF document text
    • https://cdn.sqhk.co/jelivapizivo/2igjgvE/dagaxugotoxozava.pdfIn PDF document text
    • http://fixmarker.fun/applied_statistical_modeling_and_data_analytics4oh50.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/pNBgcji/cars_movie_names_and_images.pdfIn PDF document text
    • https://cdn.sqhk.co/pojuwudedi/V38tYCX/fortnite_gamertag_name_generator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446147/normal_602c468b92911.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384819/normal_6024a19ff31ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379846/normal_5ff25f3add728.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://176fe727-baa2-4f6f-8ab0-cddcd97ecb74.filesusr.com/ugd/45df28_5f7ca04877df49749d9f06dc051da32b.pdf?index=trueIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_0a7096ece72c44cf9c2257006acd1030.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD9 5632 bytes
SHA-256: 603b7c84a52b708411fb9a630561e240405fbcd32d2d91d7166f444e6ddf8e9f
font_01_sfnt_off000132a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A4 11532 bytes
SHA-256: a06ba40798f1260f394602d040bae658e66e97022bea621bea8c4353410249b9

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